WO2006019614A2 - Method of delivering direct proof private keys in signed groups to devices using a distribution cd - Google Patents
Method of delivering direct proof private keys in signed groups to devices using a distribution cd Download PDFInfo
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- WO2006019614A2 WO2006019614A2 PCT/US2005/024253 US2005024253W WO2006019614A2 WO 2006019614 A2 WO2006019614 A2 WO 2006019614A2 US 2005024253 W US2005024253 W US 2005024253W WO 2006019614 A2 WO2006019614 A2 WO 2006019614A2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/083—Network architectures or network communication protocols for network security for authentication of entities using passwords
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
- G06F12/10—Address translation
- G06F12/1027—Address translation using associative or pseudo-associative address translation means, e.g. translation look-aside buffer [TLB]
- G06F12/1036—Address translation using associative or pseudo-associative address translation means, e.g. translation look-aside buffer [TLB] for multiple virtual address spaces, e.g. segmentation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/50—Monitoring users, programs or devices to maintain the integrity of platforms, e.g. of processors, firmware or operating systems
- G06F21/57—Certifying or maintaining trusted computer platforms, e.g. secure boots or power-downs, version controls, system software checks, secure updates or assessing vulnerabilities
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/71—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information
- G06F21/73—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information by creating or determining hardware identification, e.g. serial numbers
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/48—Program initiating; Program switching, e.g. by interrupt
- G06F9/4806—Task transfer initiation or dispatching
- G06F9/4843—Task transfer initiation or dispatching by program, e.g. task dispatcher, supervisor, operating system
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0894—Escrow, recovery or storing of secret information, e.g. secret key escrow or cryptographic key storage
- H04L9/0897—Escrow, recovery or storing of secret information, e.g. secret key escrow or cryptographic key storage involving additional devices, e.g. trusted platform module [TPM], smartcard or USB
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3218—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using proof of knowledge, e.g. Fiat-Shamir, GQ, Schnorr, ornon-interactive zero-knowledge proofs
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3236—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using cryptographic hash functions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
Definitions
- the present invention relates generally to computer security and, more specifically, to securely distributing cryptographic keys to devices in processing systems.
- Some processing system architectures supporting content protection and/or computer security features require that specially-protected or "trusted” software modules be able to create an authenticated encrypted communications session with specific protected or “trusted” hardware devices in the processing system (such as graphics controller cards, for example).
- One commonly used method for both identifying the device and simultaneously establishing the encrypted communications session is to use a one-side authenticated Diffie-
- DH Helman
- RSA Rivest, Shamir and Adelman
- ECC Elliptic Curve Cryptography
- FIG. 1 illustrates a system featuring a platform implemented with a Trusted Platform Module (TPM) that operates in accordance with one embodiment of the invention
- TPM Trusted Platform Module
- Figure 2 illustrates a first embodiment of the platform including the TPM of Figure 1.
- Figure 3 illustrates a second embodiment of the platform including the TPM of Figure 1.
- Figure 4 illustrates an exemplary embodiment of a computer system implemented with the TPM of Figure 2.
- Figure 5 is a diagram of a system for distributing Direct Proof keys in signed groups according to an embodiment of the present invention
- Figure 6 is a flow diagram illustrating stages of a method of distributing Direct Proof keys in signed groups according to an embodiment of the present invention
- Figures 7 and 8 are flow diagrams illustrating device manufacturing set-up processing according to an embodiment of the present invention
- Figure 9 is a flow diagram illustrating device manufacturing production processing according to an embodiment of the present invention.
- FIGS 10 and 11 are flow diagrams of client computer system set-up processing according to an embodiment of the present invention.
- Figure 12 is a flow diagram of client computer system processing according to an embodiment of the present invention.
- Direct Proof-based Diffie-Helman key exchange protocol to permit protected/trusted devices to authenticate themselves and to establish an encrypted communication session with trusted software modules avoids creating any unique identity information in the processing system, and thereby avoids introducing privacy concerns.
- directly embedding a Direct Proof private key in a device on a manufacturing line requires more protected non-volatile storage on the device than other approaches, increasing device costs.
- An embodiment of the present invention is a method to allow Direct Proof private keys (e.g., used for signing) to be delivered in signed groups in a secure manner on a distribution compact disc-read only memory (CD-ROM or CD), and subsequently installed in the device by the device itself.
- CD-ROM or CD distribution compact disc-read only memory
- the reduction in device storage required to support this capability may be from approximately 300 to 700 bytes down to approximately 20-25 bytes. This reduction in the amount of non-volatile storage required to implement Direct Proof- based Diffie-Helman key exchange for devices may result in broader adoption of this technique.
- platform is defined as any type of communication device that is adapted to transmit and receive information. Examples of various platforms include, but are not limited or restricted to computer systems, personal digital assistants, cellular telephones, set-top boxes, facsimile machines, printers, modems, routers, or the like.
- a "communication link” is broadly defined as one or more information-carrying mediums adapted to a platform. Examples of various types of communication links include, but are not limited or restricted to electrical wire(s), optical fiber(s), cable(s), bus trace(s), or wireless signaling technology.
- a “challenger” refers to any entity (e.g., person, platform, system, software, and/or device) that requests some verification of authenticity or authority from another entity. Normally, this is performed prior to disclosing or providing the requested information.
- a “responder” refers to any entity that has been requested to provide some proof of its authority, validity, and/or identity.
- a “device manufacturer,” which may be used interchangeably with “certifying manufacturer,” refers to any entity that manufactures or configures a platform or device.
- a challenger that a responder has possession or knowledge of some cryptographic information (e.g., digital signature, a secret such as a key, etc.) means that, based on the information and proof disclosed to the challenger, there is a high probability that the responder has the cryptographic information. To prove this to a challenger without "revealing" or
- “disclosing" the cryptographic information to the challenger means that, based on the information disclosed to the challenger, it would be computationally infeasible for the challenger to determine the cryptographic information.
- Direct proof refers to zero-knowledge proofs, as these types of proofs are commonly known in the field.
- Direct Proof defines a protocol in which an issuer defines a family of many members that share common characteristics as defined by the issuer. The issuer generates a Family public and private key pair (Fpub and Fpri) that represents the family as a whole.
- the issuer can also generate a unique Direct Proof private signing key (DPpri) for each individual member in the family. Any message signed by an individual DPpri can be verified using the family public key Fpub. However, such verification only identifies that the signer is a member of the family; no uniquely identifying information about the individual member is exposed.
- the issuer may be a device manufacturer or delegate. That is, the issuer may be an entity with the ability to define device Families based on shared characteristics, generate the Family public/private key pair, and to create and inject DP private keys into devices. The issuer may also generate certificates for the Family public key that identify the source of the key and the characteristics of the device family.
- TPM Trusted Platform Module
- first platform 102 may need to verify that requested information 108 came from a device manufactured by either a selected device manufacturer or a selected group of device manufacturers (hereinafter referred to as "device manufacturer(s) 110"). For instance, for one embodiment of the invention, first platform 102 challenges second platform 104 to show that it has cryptographic information (e.g., a signature) generated by device manufacturer(s) 110. The challenge may be either incorporated into request 106 (as shown) or a separate transmission. Second platform 104 replies to the challenge by providing information, in the form of a reply, to convince first platform 102 that second platform 104 has cryptographic information generated by device manufacturer(s) 110, without revealing the cryptographic information. The reply may be either part of the requested information 108 (as shown) or a separate transmission.
- device manufacturer(s) 110 e.g., a signature
- second platform 104 comprises a
- TPM 115 is a cryptographic device that is manufactured by device manufacturer(s) 110.
- TPM 115 comprises a processor with a small amount of on-chip memory encapsulated within a package.
- TPM 115 is configured to provide information to first platform 102 that would enable it to determine that a reply is transmitted from a valid TPM.
- the information used is content that would not make it likely that the TPM's or second platform's identity can be determined.
- FIG. 2 illustrates a first embodiment of second platform 104 with TPM
- second platform 104 comprises a processor 202 coupled to TPM 115.
- processor 202 is a device that processes information.
- processor 202 may be implemented as a microprocessor, digital signal processor, micro-controller or even a state machine.
- processor 202 may be implemented as programmable or hard- coded logic, such as Field Programmable Gate Arrays (FPGAs), transistor- transistor logic (TTL) logic, or even an Application Specific Integrated Circuit (ASIC).
- FPGAs Field Programmable Gate Arrays
- TTL transistor- transistor logic
- ASIC Application Specific Integrated Circuit
- second platform 104 further comprises a storage unit 206 to permit storage of cryptographic information such as one or more of the following: keys, hash values, signatures, certificates, etc.
- a hash value of "X" may be represented as "Hash(X)". It is contemplated that such information may be stored within internal memory 220 of TPM 115 in lieu of storage unit 206 as shown in Figure 3.
- the cryptographic information may be encrypted, especially if stored outside TPM 115.
- Figure 4 illustrates an embodiment of a platform including a computer system 300 implemented with TPM 115 of Figure 2.
- Computer system 300 comprises a bus 302 and a processor 310 coupled to bus 302.
- Computer system 300 further comprises a main memory unit 304 and a static memory unit 306.
- main memory unit 304 is volatile semiconductor memory for storing information and instructions executed by processor 310.
- Main memory 304 also may be used for storing temporary variables or other intermediate information during execution of instructions by processor 310.
- Static memory unit 306 is non ⁇ volatile semiconductor memory for storing information and instructions for processor 310 on a more permanent nature. Examples of static memory 306 include, but are not limited or restricted to read only memory (ROM). Both main memory unit 304 and static memory unit 306 are coupled to bus 302.
- computer system 300 further comprises a data storage device 308 such as a magnetic disk or optical disc and its corresponding drive may also be coupled to computer system 300 for storing information and instructions.
- Computer system 300 can also be coupled via bus 302 to a graphics controller device 314, which controls a display (not shown) such as a cathode ray tube (CRT), Liquid Crystal Display (LCD) or any flat panel display, for displaying information to an end user.
- a display such as a cathode ray tube (CRT), Liquid Crystal Display (LCD) or any flat panel display, for displaying information to an end user.
- CTR cathode ray tube
- LCD Liquid Crystal Display
- an alphanumeric input device 316 may be coupled to bus 302 for communicating information and/or command selections to processor 310.
- cursor control unit 318 such as a mouse, a trackball, touch pad, stylus, or cursor direction keys for communicating direction information and command selections to processor 310 and for controlling cursor movement on display 314.
- a communication interface unit 320 is also coupled to bus 302.
- Examples of interface unit 320 include a modem, a network interface card, or other well- known interfaces used for coupling to a communication link forming part of a local or wide area network.
- computer system 300 may be coupled to a number of clients and/or servers via a conventional network infrastructure, such as a company's Intranet and/or the Internet, for example.
- computer system 300 will vary from implementation to implementation depending upon numerous factors, such as price constraints, performance requirements, technological improvements, and/or other circumstances.
- computer system 300 may support the use of specially-protected "trusted” software modules (e.g., tamper-resistant software, or systems having the ability to run protected programs) stored in main memory 304 and/or mass storage device 308 and being executed by processor 310 to perform specific activities, even in the presence of other hostile software in the system.
- trusted software modules e.g., tamper-resistant software, or systems having the ability to run protected programs
- main memory 304 and/or mass storage device 308 and being executed by processor 310 to perform specific activities, even in the presence of other hostile software in the system.
- Some of these trusted software modules require equivalently "trustable” protected access not just to other platforms, but to one or more devices within the same platform, such as graphics controller 314, for example. In general, such access requires that the trusted software module be able to identify the device's capabilities and/or specific identity, and then establish an encrypted session with the device to permit the exchange of data that cannot be snooped or spoofed by other software in the system.
- One prior art method of both identifying the device and simultaneously establishing the encrypted session is to use a one-side authenticated Diffie- Hellman (DH) key exchange process.
- DH Diffie- Hellman
- the device is assigned a unique public/private RSA or ECC key pair.
- the device holds and protects the private key, while the public key, along with authenticating certificates, may be released to the software module.
- the device signs a message using its private key, which the software module can verify using the corresponding public key. This permits the software module to authenticate that the message did in fact come from the device of interest.
- the device has a unique and provable identity. Any software module that can get the device to sign a message with its private key can prove that this specific unique device is present in the computer system. Given that devices rarely migrate between processing systems, this also represents a provable unique computer system identity. Furthermore, the device's public key itself represents a constant unique value; effectively a permanent "cookie.” In some cases, these characteristics may be construed as a significant privacy problem.
- embodiments of the present invention define a system and process for ensuring that the device has the Direct Proof private key when it needs the key, without requiring substantial additional storage in the device.
- the DP keys are delivered in signed groups to the client computer system.
- a device manufacturer only stores a 128-bit pseudorandom number into a device while the device is being produced in the manufacturing line, while a much larger Direct Proof private key (DPpri) may be encrypted and delivered using a distribution CD.
- Other embodiments may store a number into the device that is longer or shorter than 128 bits. This process ensures that only a specified device can decrypt and use its assigned DPpri key.
- DPpri encrypted data structures may be delivered in Group records signed by a device manufacturer.
- the entire Group record must be delivered to the device, which extracts only its own encrypted keyblob.
- an attacker cannot infer which keyblob was selected based on timing attacks.
- signing the record, and requiring the device to verify the signature before processing its keyblob one may ensure that an attacker cannot supply multiple copies of a single keyblob to test the device's response.
- the best that an attacker can determine is that the device is a member of the Group.
- the device stores a pseudorandom value of a predetermined size (e.g., 128 bits), a group identifier (e.g., 4 bytes) and a 20-byte hash of the device manufacturer's Group public key, for a total of approximately 40 bytes of data.
- a predetermined size e.g., 128 bits
- a group identifier e.g., 4 bytes
- a 20-byte hash of the device manufacturer's Group public key for a total of approximately 40 bytes of data.
- Figure 5 is a diagram of a system 500 for distributing Direct Proof keys in signed groups according to an embodiment of the present invention.
- the device manufacturing protected system comprises a processing system used in the set-up process prior to manufacturing of a device 506.
- the protected system 502 may be operated by a device manufacturer or other entity such that the protected system is protected from attack from hackers outside the device manufacturing site (e.g., it is a closed system).
- Manufacturing production system 503 may be used in the manufacturing of the devices.
- the protected system and the production system may be the same system.
- Device 506 comprises any hardware device for inclusion in the client computer system (e.g., a memory controller, a peripheral device such as a graphics controller, an I/O device, other devices, etc.).
- the device comprises a pseudorandom value RAND 508 and a Group Number 509, stored in non-volatile storage of the device.
- the manufacturing protected system includes a protected database 510 and a generation function 512.
- the protected database comprises a data structure for storing multiple pseudorandom values (at least as many as one per device to be manufactured) generated by generation function 512 in a manner as described below.
- the generation function comprises logic (either implemented in software or hardware) to generate a data structure called a keyblob 514 herein. Keyblob 514 comprises at least three data items.
- a unique Direct Proof private key (DPpri) comprises a cryptographic key which may be used by a device for signing.
- DP private digest 516 (DPpri Digest) comprises a message digest of DPpri according to any well-known method of generating a secure message digest, such as SHA-1.
- Some embodiments may include a pseudorandom initialization vector (IV) 518 comprising a bit stream as part of the keyblob for compatibility purposes. If a stream cipher is used for the encryption, then the IV is used in a well known method for using an IV in a stream cipher. If a block cipher is used for the encryption, then the IV will be used as part of the message to be encrypted, thus making each instance of the encryption be different.
- the manufacturing protected system generates one or more keyblobs (as described in detail below) and stores the keyblobs in Group Records 515 in a keyblob database 520 on a CD 522.
- each Group Record there may be many keyblobs in each Group Record, and many Group Records on a single CD, in any combination, the only limitation being the physical storage limits of the CD.
- each Group Record comprises a plurality of keyblobs.
- the CD is then distributed through typical physical channels to computer system manufacturers, computer distributors, client computer system consumers, and others.
- a CD is described herein as the storage medium, any suitable removable storage medium may be used (e.g., a digital versatile disk (DVD), or other medium).
- DVD digital versatile disk
- a client computer system 504 desiring to use a Direct Proof protocol for authentication and key exchange of a communications session with device 506 included within system 504 may read a selected Group Record 515 out of the keyblob database 520 on the CD, once the CD is inserted into a CDROM drive (not shown) of the client computer system.
- the keyblob data may be obtained from the Group Record and used by the device to generate a localized keyblob 524 (as described below) for use in implementing the Direct Proof protocol.
- a whole Group Record comprising a plurality of keyblobs is processed by the device at a time, and an attacker may not be able to determine which specific keyblob is actually being used to generate the encrypted localized keyblob.
- Device driver software 526 is executed by the client computer system to initialize and control device 506.
- FIG 6 is a flow diagram 600 illustrating stages of a method of distributing Direct Proof keys according to an embodiment of the present invention. According to embodiments of the present invention, certain actions may be performed at each stage.
- set-up stage 602 At a site of a device manufacturer, there are at least two stages: set-up stage 602 and manufacturing production stage 604. The set-up stage is described herein with reference to Figure 7. The manufacturing production stage is described herein with reference to Figure 8.
- At a consumer site having the client computer system there are at least two stages: set-up stage 606, and use stage 608.
- the client computer system set-up stage is described herein with reference to Figure 9.
- the client computer system use stage is described herein with reference to Figure 10.
- FIGS 7 and 8 are flow diagrams 700 and 800 illustrating device manufacturing set-up processing according to an embodiment of the present invention.
- a device manufacturer may perform these actions using a manufacturing protected system 502.
- the device manufacturer generates a Direct Proof Family key pair (Fpub and Fpri) for each class of devices to be manufactured.
- Each unique device will have a corresponding DPpri key such that a signature created using DPpri may be verified by Fpub.
- a class of devices may comprise any set or subset of devices, such as a selected product line (i.e., type of device) or subsets of a product line based on version number, or other characteristics of the devices.
- the Family key pair is for use by the class of devices for which it was generated.
- the device manufacturer generates an RSA key pair (Gpri,
- the device manufacturer selects a desired Group Size.
- the Group Size may be the number of devices in the family that will be grouped together.
- the Group Size is chosen to be large enough to allow an individual device to "hide" within the Group, yet not so large as to consume undue time during keyblob extraction processing by the device.
- the Group Size may be chosen to be 5,000 devices. In other embodiments, others sizes may be used.
- the device manufacturer may then generate the number of device keys specified by the Group Size.
- Each Group having a number of devices specified by Group Size may be designated by a Group Number.
- generation function 512 or other modules of manufacturing protected system 502 may perform blocks 704 of Figure 7 to 802 of Figure 8.
- the generation function generates a unique pseudo ⁇ random value (RAND) 508.
- RAND pseudo ⁇ random value
- the length of RAND is 128 bits. In other embodiments, other sizes of values may be used.
- the pseudo-random values for a number of devices may be generated in advance.
- the one-way function may be any known algorithm appropriate for this purpose (e.g., SHA-1 , MGF1, Data Encryption Standard (DES), Triple DES, etc.).
- ID identifier
- the generation function generates the DP private signing key DPpri correlating to the device's Family public key (Fpub).
- the generation function hashes DPpri to produce DPpri Digest using known methods (e.g., using SHA-1 or another hash algorithm).
- the generation function builds a keyblob data structure for the device.
- the keyblob includes at least DPpri and DPpri Digest.
- the keyblob also includes a random initialization vector (IV) having a plurality of pseudo-randomly generated bits. These values may be encrypted using SKEY to produce an encrypted keyblob 514.
- the Device ID generated at block 708 and the encrypted keyblob 514 generated at block 714 may be stored in a record in a keyblob database 520 to be released on the distribution CD 522.
- the record in the keyblob database may be indicated by the Device ID. Processing continues with block 801 on Figure 8. At block 801, the current
- RAND value and the current Group Number for the Group to which the device belongs may be stored in protected database 510.
- SKEY and DPpri may be deleted, since they will be regenerated by the device in the field.
- the Group Number may be incremented for each successive Group of devices being manufactured.
- the creation of the DPpri Digest and the subsequent encryption by SKEY are designed so that the contents of DPpri cannot be determined by any entity that does not have possession of SKEY and so that the contents of the KeyBlob cannot be modified by an entity that does not have possession of SKEY without subsequent detection by an entity that does have possession of SKEY. In other embodiments, other methods for providing this secrecy and integrity protection could be used.
- the integrity protection may not be required, and a method that provided only secrecy could be used. In this case, the value of DPpri Digest would not be necessary.
- the entire data set of keyblobs has been created for a Group of devices, at least that Group's keyblob database 520 may be signed and burned to a common distribution CD, to be distributed with each device (In one embodiment, one keyblob database entry may be used for each device, as indexed by the Device ID field).
- the device manufacturer creates a Group Record 515.
- the Group Record comprises the Group Number, the Group's public key Gpub, the Group Size, and the keyblob records of the entire Group ( ⁇ Group Number, Gpub, Group Size, ⁇ Device ID1 , Encrypted Keyblob1>, ⁇ Device ID2, Encrypted Keyblob2>, ...>).
- the device manufacturer signs the Group Record using the Group private key Gpri and appends the digital signature to the Group Record.
- the signed Group Record may be added to the keyblob database on the distribution CD.
- the distribution CD also comprises a Key Retrieval utility software module for future processing on the client computer system, whose use is described in further detail below.
- the protected database of RAND and Group Number value pairs may be securely uploaded to manufacturing production system 503 that will store the RAND and Group Number values into the devices during the manufacturing process. Once this upload has been verified, the RAND values could be securely deleted from the manufacturing protected system 502.
- FIG. 9 is a flow diagram 900 illustrating device manufacturing production processing according to an embodiment of the present invention.
- the manufacturing production system selects an unused RAND and Group Number value pair from the protected database.
- the selected RAND and Group Number value may then be stored into non-volatile storage in a device.
- the non ⁇ volatile storage comprises a TPM.
- a hash of the Group public key Gpub may also be stored into non-volatile storage of the device.
- the manufacturing production system destroys any record of that device's RAND value in the protected database. At this point, the sole copy of the RAND value is stored in the device.
- the RAND value could be created during the manufacturing of a device, and then sent to the manufacturing protected system for the computation of a keyblob.
- the RAND value could be created on the device, and the device and the manufacturing protected system could engage in a protocol to generate the DPpri key using a method that does not reveal the DPpri key outside of the device. Then the device could create the Device ID, the SKEY, and the keyblob. The device would pass the Device ID and the keyblob to the manufacturing system for storage in protected database 510. In this method, the manufacturing system ends up with the same information (Device ID, keyblob) in the protected database, but does not know the values of RAND or of DPpri.
- FIGS 10 and 11 are flow diagrams 1000 and 1100 of client computer system set-up processing according to an embodiment of the present invention.
- a client computer system may perform these actions as part of booting up the system.
- the client computer system may be booted up in the normal manner and a device driver 526 for the device may be loaded into main memory.
- the device driver determines at block 1004 if there is already an encrypted localized keyblob 524 stored in mass storage device 308 for device 506. If there is, then no further set-up processing need be performed and set-up processing ends at block 1006. If not, then processing continues with block 1008.
- the device driver causes the display of a message to the user of the client computer system asking for the insertion of the distribution CD 522.
- the device driver launches the Key Retrieval utility software module (not shown in Figure 5) stored on the CD.
- the Key Retrieval utility asks the device for its Group ID, which may be the hash of the Group public key Gpub, and Group Number 509.
- the devise returns these values, which the utility uses to locate the proper signed Group Record from the keyblob database on the CD.
- This utility also issues an Acquire Key command to the device 506 to initiate the device's DP private key acquisition process.
- the device then signals its readiness to proceed.
- the Key Retrieval utility searches the keyblob database 520 on the CD for the Group Record containing the matching Group Number, extracts the Group Record, and transfers the entire Group Record to the device.
- the device parses the entire supplied Group Record, but keeps only the Group Number, the hash of the Group Record, the Group public key Gpub, and the first ⁇ Device ID, Encrypted Keyblob> field that matches the device's own Device ID (generated in block 1012).
- the device now verifies the Group Record. In one embodiment, the device compares the extracted Group Number field to the Group Number embedded in the device. If they do not match, the key acquisition process may be terminated. If not, the device hashes the extracted Gpub field and compares it to the Gpub hash embedded in the device. If the hashes do not match, the key acquisition process may be terminated.
- the device uses the validated Gpub key to veridy the supplied signature on the hash of the Group Record. If the signature verifies, the Group Record is verified and the process continues with block 1120 on Figure 11.
- the device if rogue software tries to send an Acquire Key command to the device after the device has the keyblob, the device does not respond to the rogue software with the Group Number. Instead, the device will return an error indicator. In effect, if the device has access to a localized keyblob, then the functionality of the Acquire Key command is disabled. In this way, the device does not reveal the Group Number except when it does not have the keyblob.
- the initialization vector (IV) may be discarded.
- the device then checks the integrity of DPpri by hashing DPpri and comparing the result against DPpri Digest. If the comparison is good, the device accepts DPpri as its valid key. The device may also set a Key Acquired flag to true to indicate that the DP private key has been successfully acquired.
- the new encrypted localized keyblob may be returned to the Key Retrieval utility.
- the Key Retrieval utility stores the encrypted, localized keyblob in storage within the client computer system (such as mass storage device 308, for example).
- the device's DPpri is now securely stored in the client computer system.
- FIG 12 is a flow diagram of client computer system processing according to an embodiment of the present invention.
- the client computer system may perform these actions anytime after set-up has been completed.
- the client computer system may be booted up in the normal manner and a device driver 526 for the device may be loaded into main memory.
- the device driver determines if there is already an encrypted localized keyblob 524 stored in mass storage device 308 for device 506. If there is not, then the set-up processing of Figures 10 and 11 are performed. If there is an encrypted localized keyblob available for this device, then processing continues with block 1206.
- the device driver retrieves the encrypted localized keyblob and transfers the keyblob to the device. In one embodiment, the transfer of the keyblob may be accomplished by executing a Load Keyblob command.
- the second initialization vector (IV2) may be discarded.
- the device checks the integrity of DPpri by hashing DPpri and comparing the result against DPpri Digest.
- the device accepts DPpri as the valid key acquired earlier, and enables it for use.
- the device may also set a Key Acquired flag to true to indicate that the DP private key has been successfully acquired.
- the new encrypted localized keyblob may be returned to the Key Retrieval utility.
- the Key Retrieval utility stores the encrypted, localized keyblob in storage within the client computer system (such as mass storage device 308, for example).
- the device's DPpri is now securely stored once again in the client computer system.
- the device DP private keys could be generated in batches as needed. Each time the distribution CD was "burned," it would contain signed groups for the keyblob database as generated to date, including those device keys that had been generated but not yet assigned to devices. In one embodiment, when processing the entire Group Record as in block
- the device may set a flag indicating that the error has occurred, but should continue processing. When all of the steps have been completed for system set-up, then the device can signal the error to the device driver. This may keep an attacker from gaining information from the type and location of the error.
- the methods described herein may use approximately 40 bytes of non-volatile storage in the device. In another embodiment, this may be reduced to approximately 20 bytes if the Gpub key hash is included in the device's encrypted keyblob instead of stored in non-volatile storage on the device. In this case, when the device decrypts the encrypted keyblob, the device may retrieve the Gpub hash, use the hash to check the Gpub key, and use the Gpub key to check the signature on the entire Group Record.
- the techniques described herein are not limited to any particular hardware or software configuration; they may find applicability in any computing or processing environment.
- the techniques may be implemented in hardware, software, or a combination of the two.
- the techniques may be implemented in programs executing on programmable machines such as mobile or stationary computers, personal digital assistants, set top boxes, cellular telephones and pagers, and other electronic devices, that each include a processor, a storage medium readable by the processor (including volatile and non-volatile memory and/or storage elements), at least one input device, and one or more output devices.
- Program code is applied to the data entered using the input device to perform the functions described and to generate output information.
- the output information may be applied to one or more output devices.
- the invention can be practiced with various computer system configurations, including multiprocessor systems, minicomputers, mainframe computers, and the like.
- the invention can also be practiced in distributed computing environments where tasks may be performed by remote processing devices that are linked through a communications network.
- Each program may be implemented in a high level procedural or object oriented programming language to communicate with a processing system.
- programs may be implemented in assembly or machine language, if desired. In any case, the language may be compiled or interpreted.
- Program instructions may be used to cause a general-purpose or special- purpose processing system that is programmed with the instructions to perform the operations described herein. Alternatively, the operations may be performed by specific hardware components that contain hardwired logic for performing the operations, or by any combination of programmed computer components and custom hardware components.
- the methods described herein may be provided as a computer program product that may include a machine readable medium having stored thereon instructions that may be used to program a processing system or other electronic device to perform the methods.
- machine readable medium used herein shall include any medium that is capable of storing or encoding a sequence of instructions for execution by the machine and that cause the machine to perform any one of the methods described herein.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200580023727.0A CN1985466B (en) | 2004-07-14 | 2005-07-08 | Method of delivering direct proof private keys in signed groups to devices using a distribution CD |
JP2007521514A JP4638912B2 (en) | 2004-07-14 | 2005-07-08 | Method for transmitting a direct proof private key in a signed group to a device using a distribution CD |
DE112005001666T DE112005001666B4 (en) | 2004-07-14 | 2005-07-08 | A method for providing private direct proof keys in signed groups to devices using a distribution CD |
GB0700525A GB2439160B (en) | 2004-07-14 | 2005-07-08 | Method of delivering direct proof private keys in signed groups to devices using a distribution CD |
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US10/892,280 | 2004-07-14 | ||
US10/892,280 US7693286B2 (en) | 2004-07-14 | 2004-07-14 | Method of delivering direct proof private keys in signed groups to devices using a distribution CD |
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WO2006019614A2 true WO2006019614A2 (en) | 2006-02-23 |
WO2006019614A3 WO2006019614A3 (en) | 2006-12-07 |
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PCT/US2005/024253 WO2006019614A2 (en) | 2004-07-14 | 2005-07-08 | Method of delivering direct proof private keys in signed groups to devices using a distribution cd |
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US (1) | US7693286B2 (en) |
JP (1) | JP4638912B2 (en) |
CN (1) | CN1985466B (en) |
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GB (1) | GB2439160B (en) |
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Also Published As
Publication number | Publication date |
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CN1985466A (en) | 2007-06-20 |
GB2439160B (en) | 2009-01-14 |
JP4638912B2 (en) | 2011-02-23 |
CN1985466B (en) | 2013-03-06 |
DE112005001666B4 (en) | 2009-12-31 |
DE112005001666T5 (en) | 2007-05-03 |
WO2006019614A3 (en) | 2006-12-07 |
US20060013400A1 (en) | 2006-01-19 |
GB0700525D0 (en) | 2007-02-21 |
JP2008507203A (en) | 2008-03-06 |
US7693286B2 (en) | 2010-04-06 |
GB2439160A (en) | 2007-12-19 |
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